Doc: update Clever Cloud CLI section

[sebartyr]

Checking for existing issue

• I have checked for existing issues

Describe the content you'd like to see

I'd like to update CLI section as far as there are lot of new features in last versions.

[PLhuillery]

I recall a chat with the CLI team mentioning that only the Github is updated for new features.
I'm checking with them.

[PLhuillery]

After checking with David, it would be a good idea to have a more detailed documentation for "human-reading", and a Github link for reference etc....

I do find more streamlined to have CC Documentation holding most of the relevant information. I'd rather avoid being sent to a Github repo that lacks readability after searching the Clever Cloud Documentation